Set top box



FIG. 1 is a right side elevation view of a set top box showing our new design;

FIG. 2 is a front view;

FIG. 3 is a top plan view;

FIG. 4 is a bottom plan view;

FIG. 5 is a right side view;

FIG. 6 is a left side view; and,

FIG. 7 is a rear view. 

The ornamental design for a set top box, as shown and described. 